US10720536B2 - Solar cell module - Google Patents

Solar cell module Download PDF

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Publication number
US10720536B2
US10720536B2 US15/254,719 US201615254719A US10720536B2 US 10720536 B2 US10720536 B2 US 10720536B2 US 201615254719 A US201615254719 A US 201615254719A US 10720536 B2 US10720536 B2 US 10720536B2
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layer
solar cells
solar cell
cell module
colored
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US20170069767A1 (en
Inventor
Minpyo KIM
Yikhyun JEON
Taeyoon Kim
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Trina Solar Co Ltd
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LG Electronics Inc
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Assigned to SHANGRAO JINKO SOLAR TECHNOLOGY DEVELOPMENT CO., LTD reassignment SHANGRAO JINKO SOLAR TECHNOLOGY DEVELOPMENT CO., LTD ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LG ELECTRONICS INC.
Assigned to Shangrao Xinyuan YueDong Technology Development Co. Ltd reassignment Shangrao Xinyuan YueDong Technology Development Co. Ltd CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: SHANGRAO JINKO SOLAR TECHNOLOGY DEVELOPMENT CO., LTD
Assigned to TRINA SOLAR CO., LTD. reassignment TRINA SOLAR CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SHANGRAO XINYUAN YUEDONG TECHNOLOGY DEVELOPMENT CO. LTD.
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/02—Details
    • H01L31/0216—Coatings
    • H01L31/02161—Coatings for devices characterised by at least one potential jump barrier or surface barrier
    • H01L31/02167—Coatings for devices characterised by at least one potential jump barrier or surface barrier for solar cells
    • H01L31/02168—Coatings for devices characterised by at least one potential jump barrier or surface barrier for solar cells the coatings being antireflective or having enhancing optical properties for the solar cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/048—Encapsulation of modules
    • H01L31/049—Protective back sheets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
    • H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy

Definitions

  • Embodiments of the invention relate to a solar cell module.
  • a solar cell generally includes semiconductor parts, which respectively have different conductive types, for example, a p-type and an n-type and thus form a p-n junction, and electrodes respectively connected to the semiconductor parts of the different conductive types.
  • a plurality of solar cells each having the above-described configuration may be connected in series or in parallel in order to obtain a desired output and may be thermally compressed between a front transparent substrate and a back sheet, thereby manufacturing a solar cell module of a panel form.
  • An interconnector may be formed between the plurality of solar cells in order to connect the plurality of solar cells in series or in parallel. When the interconnector is visually perceived, the interconnector may be a hindrance to a neat appearance of the solar cell module.
  • a solar cell module including a plurality of solar cells receiving light from the outside and producing electricity, a conductive line connected to an adjacent pair of the plurality of solar cells and electrically connecting the adjacent pair of the plurality of solar cells to one another, a front transparent substrate disposed on front surfaces of the plurality of solar cells and on the conductive line, the front transparent substrate transmitting the light, and a back sheet disposed on back surfaces of the plurality of solar cells and on the conductive line, wherein the back sheet has the same based color as a color of the conductive line when viewed from a front of the solar cell module.
  • the back sheet may include a colored thin film layer having the same based color as the color of the conductive line or a colored pigment layer including a colored pigment having the same based color as the color of the conductive line.
  • the back sheet may include the colored thin film layer.
  • the back sheet may further include a first sheet layer of an insulating material on a back surface of the colored thin film layer and a second sheet layer of a transparent insulating material on a front surface of the colored thin film layer.
  • the insulating materials of the first and second sheet layers may include at least one of polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), polyvinyl fluoride (PVF), and polyvinylidene difluoride (PVDF).
  • PET polyethylene terephthalate
  • PE polyethylene
  • PP polypropylene
  • PVF polyvinyl fluoride
  • PVDF polyvinylidene difluoride
  • the first sheet layer may include a white pigment.
  • the colored thin film layer may be formed as a thin film layer of a metal material.
  • the metal material of the colored thin film layer may include at least one of aluminum (Al) and silver (Ag).
  • Thicknesses of the first and second sheet layers may be greater than a thickness of the colored thin film layer.
  • the thicknesses of the first and second sheet layers may be 80 ⁇ m to 120 ⁇ m, and the thickness of the colored thin film layer may be 0.5 ⁇ m to 50 ⁇ m.
  • the back sheet may include the colored pigment layer.
  • the colored pigment layer may include the colored pigment in at least one insulating material of polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), polyvinyl fluoride (PVF), and polyvinylidene difluoride (PVDF).
  • the colored pigment may be particles having a diameter or a length of 5 ⁇ m to 50 ⁇ m.
  • An amount of the colored pigment with respect to the at least one insulating material in the colored pigment layer may be about 10 vol % to 40 vol %.
  • the back sheet may further include a first sheet layer of a white insulating material on a back surface of the colored pigment layer.
  • the colored thin film layer or the colored pigment layer may be positioned between the plurality of solar cells when viewed from the front surface of the solar cell module.
  • the conductive line may include a core including at least one of copper (Cu) or aluminum (Al) and a coating layer that is coated on a surface of the core and includes tin (Sn).
  • the conductive line may include a first conductive line that extends in the same direction as an electrical connection direction of the plurality of solar cells and is connected to each of the plurality of solar cells.
  • the conductive line may include a second conductive line that is positioned between the plurality of solar cells, is spaced apart from the plurality of solar cells, extends in a direction crossing the first conductive line, and is connected to the first conductive line.
  • the back sheet may include a first sheet layer, a second sheet layer, and a colored thin film layer or a colored pigment layer disposed between the first sheet layer and the second sheet layer.
  • the colored thin film layer or the colored pigment layer may be located at an area corresponding to a gap between the adjacent pair of the plurality of solar cells.
  • FIG. 1 is an exploded perspective view illustrating an example of a solar cell module according to an embodiment of the invention
  • FIGS. 2 to 5 illustrate various examples of a string applicable to a solar cell module according to an embodiment of the invention
  • FIGS. 6 to 9 illustrate various examples of a back sheet in a cross section of a solar cell module according to an embodiment of the invention
  • FIG. 10 illustrates a formation area of a colored thin film layer or a colored pigment layer in a back sheet according to another embodiment of the invention.
  • FIG. 11 illustrates a cross section of a solar cell module, to which a back sheet according to another embodiment of the invention is applied.
  • an element such as a layer, film, region, or substrate is referred to as being “entirely” on other element, it may be on the entire surface of the other element and may not be on a portion of an edge of the other element.
  • FIG. 1 is an exploded perspective view illustrating an example of a solar cell module according to an embodiment of the invention.
  • a solar cell module 100 may include a plurality of solar cells 10 , a front transparent substrate 40 , an encapsulant 30 , and a back sheet 50 .
  • Each of the plurality of solar cells 10 receives light incident from the outside and produces electricity.
  • Each solar cell 10 may include a semiconductor layer, that forms a p-n junction causing light incident from the outside to be separated into holes and electrons, and electrodes collecting carriers separated into holes and electrons.
  • Examples of the solar cell 10 applicable to the solar cell module 100 according to the embodiment of the invention may include a conventional solar cell, in which electrodes are disposed on each of a front surface and a back surface of a semiconductor substrate, and a back contact solar cell, in which electrodes are disposed on a back surface of a semiconductor substrate.
  • the plurality of solar cells 10 are disposed to be spaced apart from one another.
  • the solar cell module 100 may include a plurality of conductive lines electrically connecting the plurality of solar cells 10 in series.
  • the plurality of conductive lines may electrically connect the plurality of solar cells 10 to form a string, in which the plurality of solar cells 10 is electrically connected to one another.
  • the plurality of conductive lines may be positioned between the plurality of solar cells 10 and may be a hindrance to a neat appearance of the solar cell module 100 .
  • the front transparent substrate 40 may be disposed on front surfaces of the solar cells 10 in order to protect the solar cells 10 from an external environment and may be formed of a material capable of transmitting light.
  • the front transparent substrate 40 may be formed of a tempered glass or a transparent plastic material having a high transmittance and an excellent damage prevention function.
  • the tempered glass may be a low iron tempered glass containing a small amount of iron.
  • the front transparent substrate 40 may have an embossed inner surface in order to increase a scattering effect of light.
  • the encapsulant 30 may include a first encapsulant 30 a and a second encapsulant 30 b .
  • the first encapsulant 30 a may be positioned between the solar cells 10 and the front transparent substrate 40
  • the second encapsulant 30 b may be positioned between the solar cells 10 and the back sheet 50 .
  • the first and second encapsulants 30 a and 30 b are positioned between the front transparent substrate 40 and the solar cells 10 and between the solar cells 10 and the back sheet 50 and thus can prevent a corrosion resulting from the moisture penetration and protect the solar cells 10 from an external impact.
  • the encapsulant 30 may be made of any material as long as the material is transparent.
  • the encapsulant 30 may be made of an ethylene vinyl acetate (EVA) copolymer resin, a polyvinyl butyral resin, a silicon resin, an ester-based resin, an olefin-based resin, and the like.
  • EVA ethylene vinyl acetate
  • the back sheet 50 can prevent moisture and oxygen from penetrating into back surfaces of the solar cells 10 and protect the solar cells 10 from an external environment.
  • the back sheet 50 may have a multi-layered structure including a moisture/oxygen penetrating prevention layer, a chemical corrosion prevention layer, etc.
  • the front transparent substrate 40 , the first encapsulant 30 a , the solar cells 10 , the second encapsulant 30 b , and the back sheet 50 may be integrated through a lamination process involving a thermal compression process to form the solar cell module 100 .
  • the above-described conductive lines and the back sheet 50 may be seen between the plurality of solar cells, that are spaced apart from one another.
  • the back sheet 50 seen between the solar cells 10 may have the same color as the conductive lines, so that the appearance of the solar cell module 100 is neater or more beautiful or appealing.
  • the solar cell module 100 may look as if the plurality of conductive lines is not positioned between the plurality of solar cells.
  • FIGS. 2 to 5 illustrate various examples of a string applicable to a solar cell module according to an embodiment of the invention.
  • FIG. 2 is a perspective view illustrating a first example of a string applicable to the solar cell module 100 according to the embodiment of the invention.
  • Each solar cell according to the first example may be a conventional solar cell, in which electrodes 120 are disposed on each of a front surface and a back surface of a semiconductor substrate 110 .
  • each of first and second solar cells C 1 and C 2 may include the semiconductor substrate 110 forming a p-n junction.
  • an emitter region of a first conductive type may be positioned at one of the front surface and the back surface of the semiconductor substrate 110
  • a back surface field region of a second conductive type opposite the first conductive type may be positioned at the other surface of the semiconductor substrate 11
  • the electrodes 120 respectively connected to the emitter region and the back surface field region may be disposed on each of the front surface and the back surface of the semiconductor substrate 110 .
  • a plurality of conductive lines 200 may extend in the same direction as an electrical connection direction of the plurality of solar cells and may be connected to each of the plurality of solar cells.
  • the plurality of conductive lines 200 may be connected to first conductive electrodes 120 connected to the emitter region positioned at a front surface of the first solar cell C 1 and second conductive electrodes 120 connected to the back surface field region positioned at a back surface of the second solar cell C 2 through a conductive adhesive, thereby connecting the first and second solar cells C 1 and C 2 in series.
  • Each conductive line 200 may have a conductive wire shape, in which a thickness and a width are the same as each other. About 6 to 33 conductive lines 200 may be used in the first example.
  • Each conductive line 200 may include a core including at least one of copper (Cu) or aluminum (Al) and a coating layer that is coated on a surface of the core and includes tin (Sn).
  • FIG. 3 is a perspective view illustrating a second example of a string applicable to the solar cell module 100 according to the embodiment of the invention. More specifically, FIG. 3 shows that a back surface of a solar cell upwardly faces.
  • Each solar cell according to the second example may be a back contact solar cell, in which electrodes 120 are disposed only on a back surface of a semiconductor substrate 110 .
  • each of first and second solar cells C 1 and C 2 may include an emitter region of a first conductive type and a back surface field region of a second conductive type positioned at the back surface of the semiconductor substrate 110 .
  • the electrodes 120 respectively connected to the emitter region and the back surface field region may be disposed only on the back surface of the semiconductor substrate 100 .
  • a plurality of conductive lines 200 according to the second example may extend in the same direction as an electrical connection direction of the plurality of solar cells and may be connected to each of the plurality of solar cells, in the same manner as the plurality of conductive lines 200 according to the first example.
  • the second example is different from the first example in a position of the electrode 120 included in the solar cell.
  • the plurality of conductive lines 200 according to the second example may be connected only to the back surface of each solar cell, unlike the plurality of conductive lines 200 according to the first example.
  • the plurality of conductive lines 200 may be connected to first conductive electrodes 120 positioned on a back surface of the first solar cell C 1 and second conductive electrodes 120 positioned on a back surface of the second solar cell C 2 , thereby connecting the first and second solar cells C 1 and C 2 in series.
  • a length of the conductive line 200 connecting the first and second solar cells C 1 and C 2 in series may be greater than a sum of lengths of the semiconductor substrates 110 included in the first and second solar cells C 1 and C 2 .
  • the conductive line 200 may be connected to the electrodes 120 of each solar cell through a conductive adhesive and may have a ribbon shape, in which a width is greater than a thickness. About 6 to 33 conductive lines 200 may be used in the second example.
  • Each conductive line 200 may include a core and a coating layer in the same manner as the conductive line 200 according to the first example.
  • FIG. 4 is a perspective view illustrating a third example of a string applicable to the solar cell module 100 according to the embodiment of the invention. More specifically, FIG. 4 shows that a back surface of a solar cell upwardly faces.
  • each solar cell according to the third example may be a back contact solar cell, in which electrodes 120 are disposed only on a back surface of a semiconductor substrate 110 , in the same manner as the second example.
  • a plurality of conductive lines 200 according to the third example may extend in the same direction as an electrical connection direction of the plurality of solar cells.
  • the conductive lines 200 according to the third example may include not only first conductive lines 210 connected to each solar cell but also a second conductive line 220 that is disposed between the solar cells, is spaced apart from the solar cells, and extends in a direction crossing the first conductive lines 210 .
  • the first conductive lines 210 may be connected to the second conductive line 220 .
  • a length of the first conductive line 210 according to the third example may be shorter than the length of the conductive line 200 according to the second example.
  • the first conductive lines 210 may be spaced apart from one another and may be connected to first conductive electrodes 120 of a first solar cell C 1 and second conductive electrodes 120 of a second solar cell C 2 .
  • the first conductive lines 210 connected to the first solar cell C 1 and the first conductive lines 210 connected to the second solar cell C 2 may be commonly connected to the second conductive line 220 .
  • Each of the first and second conductive lines 210 and 220 may include a core and a coating layer in the same manner as the first example.
  • the above-described conductive lines 200 may be positioned between the solar cells.
  • the conductive lines 200 seen between the solar cells may be a hindrance to the neat appearance of the solar cell module 100 .
  • the back sheet 50 has the same based color (or the same color) as a color of the conductive lines 200 electrically connecting the plurality of solar cells, the appearance of the solar cell module 100 can be neater.
  • the embodiment of the invention may cause the back sheet 50 to have the same based color as the color of the conductive lines 200 when viewed from the front surface of the solar cell module 100 .
  • the neat appearance of the solar cell module 100 according to the embodiment of the invention can be implemented as if there is no conductive line 200 between the solar cells.
  • the back sheet 50 may include a colored thin film layer having the same based color as the color of the conductive line 200 or a colored pigment layer, to which a colored pigment having the same based color as the color of the conductive line 200 is added.
  • the back sheet 50 may include a colored thin film layer or a colored pigment layer that makes the back sheet 50 be seen as a silver-based color.
  • the back sheet 50 according to the embodiment of the invention is described in detail below.
  • FIGS. 6 to 9 illustrate various examples of the back sheet 50 in a cross section of the solar cell module 100 according to the embodiment of the invention.
  • FIGS. 6 to 9 illustrate the solar cell string of FIG. 4 among the solar cell strings illustrated in FIGS. 2 to 4 , as an example.
  • the solar cell strings of FIGS. 2 and 3 may be used in FIGS. 6 to 9 .
  • reference numerals 50 A, 50 B, 50 C, and 50 D denote various examples of the back sheet 50 according to the embodiment of the invention.
  • a back sheet 50 A applicable to the solar cell module 100 may include a colored thin film layer 50 a , a first sheet layer 50 b , and a second sheet layer 50 c.
  • the colored thin film layer 50 a , the first sheet layer 50 b , and the second sheet layer 50 c may be formed on the entire back sheet 50 A in a layered structure.
  • the first sheet layer 50 b may include an opaque insulating material and may be positioned on a back surface of the colored thin film layer 50 a , i.e., an outermost side of the back sheet 50 A.
  • the second sheet layer 50 c may include a transparent insulating material and may be positioned on a front surface of the colored thin film layer 50 a , i.e., a first front surface of the back sheet 50 A. Hence, the second sheet layer 50 c may directly adjoin the encapsulant 30 .
  • the colored thin film layer 50 a may be positioned between the first and second sheet layers 50 b and 50 c , and the second sheet layer 50 c may be transparent. Therefore, when viewed from the front surface of the solar cell module 100 , the colored thin film layer 50 a may be visually seen.
  • the insulating material of the first and second sheet layers 50 b and 50 c may include at least one of polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), polyvinyl fluoride (PVF), or polyvinylidene difluoride (PVDF).
  • PET polyethylene terephthalate
  • PE polyethylene
  • PP polypropylene
  • PVF polyvinyl fluoride
  • PVDF polyvinylidene difluoride
  • the first sheet layer 50 b may further include a white pigment, for example, titanium dioxide (TiO 2 ) in addition to the above-described insulating material, in order to improve a reflectance of the back sheet 50 A.
  • a white pigment for example, titanium dioxide (TiO 2 ) in addition to the above-described insulating material, in order to improve a reflectance of the back sheet 50 A.
  • the colored thin film layer 50 a may be formed as a thin film layer of a metal material.
  • the metal material of the colored thin film layer 50 a may be at least one of aluminum (Al) or silver (Ag) having the same based color (for example, a silver color) as the color of the conductive line 200 .
  • the conductive line 200 of the silver color was described and illustrated above as an example. However, when the conductive line 200 has colors other than the silver color, the colored thin film layer 50 a may include any material and may include materials other than a metal material as long as the material has the same based color as the color of the conductive line 200 .
  • Thicknesses of the first and second sheet layers 50 b and 50 c may be greater than a thickness of the colored thin film layer 50 a .
  • the thicknesses of the first and second sheet layers 50 b and 50 c may be 80 ⁇ m to 120 ⁇ m, and the thickness of the colored thin film layer 50 a may be 0.5 ⁇ m to 50 ⁇ m.
  • the thickness of the first sheet layer 50 b may be set to 80 ⁇ m to 120 ⁇ m in consideration of the manufacturing cost and a moisture proofing function of the first sheet layer 50 b .
  • the thickness of the second sheet layer 50 c may be set to 80 ⁇ m to 120 ⁇ m in consideration of the manufacturing cost, an insulating function, and a moisture proofing function of the second sheet layer 50 c.
  • the thickness of the colored thin film layer 50 a is equal to or greater than 0.5 ⁇ m, the color of the colored thin film layer 50 a can be sufficiently seen when viewed from the front surface of the solar cell module 100 .
  • the thickness of the colored thin film layer 50 a is equal to or less than 50 ⁇ m, the manufacturing cost of the colored thin film layer 50 a can be minimized while the colored thin film layer 50 a is sufficiently seen.
  • the colored thin film layer 50 a When the colored thin film layer 50 a is formed of a metal material, for example, aluminum, the colored thin film layer 50 a may be formed of an aluminum foil or may be formed by deposing aluminum on the first sheet layer 50 b or the second sheet layer 50 c using a sputtering method.
  • a metal material for example, aluminum
  • the colored thin film layer 50 a may be formed of an aluminum foil or may be formed by deposing aluminum on the first sheet layer 50 b or the second sheet layer 50 c using a sputtering method.
  • the colored thin film layer 50 a When the colored thin film layer 50 a is formed of the aluminum foil, the colored thin film layer 50 a may have a thickness of 35 ⁇ m. When the colored thin film layer 50 a is formed using the sputtering method, the colored thin film layer 50 a may have a thickness of 0.5 ⁇ m to 1 ⁇ m.
  • the back sheet 50 A includes the colored thin film layer 50 a , it is difficult to clearly make a visual distinction between the conductive lines 200 and the back sheet 50 A when viewed from the front surface of the solar cell module 100 . Therefore, the appearance of the solar cell module 100 can be neater or more beautiful or appealing.
  • the back sheet 50 A may be configured to include the colored thin film layer 50 a . Unlike this, the back sheet 50 A may be configured to include a colored pigment layer, to which a colored pigment having the same based color as the color of the conductive line 200 is added.
  • a back sheet 50 B may be entirely formed as a colored pigment layer 50 a ′, to which a colored pigment 50 p having the same based color as the conductive line 200 is added.
  • the colored pigment layer 50 a ′ may be formed by adding the colored pigment 50 p to at least one insulating material of polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), polyvinyl fluoride (PVF), or polyvinylidene difluoride (PVDF).
  • PET polyethylene terephthalate
  • PE polyethylene
  • PP polypropylene
  • PVDF polyvinyl fluoride
  • PVDF polyvinylidene difluoride
  • the colored pigment 50 p may be particles having a diameter or a length of 5 ⁇ m to 50 ⁇ m. In this instance, the colored pigment 50 p may have the same based color as the color of the conductive line 200 . For example, the colored pigment 50 p may have a pearl silver color.
  • An amount of the colored pigment 50 p with respect to the at least one insulating material in the colored pigment layer 50 a ′ may be about 10 vol % to 40 vol %.
  • the colored pigment layer 50 a ′ may sufficiently have (or represent) its color.
  • the amount of the colored pigment 50 p exceeds about 40 vol %, it is difficult to manufacture the colored pigment layer 50 a′.
  • FIG. 7 illustrates the back sheet 50 B is entirely formed as the colored pigment layer 50 a ′ as an example.
  • a back sheet 50 C may further include a first sheet layer 50 b formed of a white insulating material of the above-described colored pigment layer 50 a ′.
  • the first sheet layer 50 b of FIG. 8 may use the same material as the first sheet layer 50 b illustrated in FIG. 6 .
  • a back sheet 50 D may include a colored pigment layer 50 a ′, a first sheet layer 50 b , and a second sheet layer 50 c .
  • the second sheet layer 50 c of FIG. 9 may use the same material as the second sheet layer 50 c illustrated in FIG. 6 .
  • FIGS. 6 to 9 illustrate that (1) the back sheet 50 includes another colored thin film layer 50 a or another colored pigment layer 50 a ′ that is entirely formed in the layered structure, or (2) the back sheet 50 is entirely formed as the colored pigment layer 50 a ′, as an example.
  • the colored thin film layer 50 a or the colored pigment layer 50 a ′ of the back sheet 50 is not formed throughout the entire area of the back sheet 50 and may be formed in a partial area of the back sheet 50 exposed through a separation space between the plurality of solar cells.
  • FIG. 10 illustrates a formation area of a colored thin film layer or a colored pigment layer in a back sheet according to another embodiment of the invention.
  • FIG. 11 illustrates a cross section of a solar cell module, to which a back sheet according to another embodiment of the invention is applied.
  • FIG. 10 is a plan view of a portion of a back sheet 50
  • (b) of FIG. 10 is a cross-sectional view of (a) of FIG. 10
  • “A 110 ” indicates an area overlapping the solar cell.
  • a back sheet 50 may include a colored thin film layer 50 a or a colored pigment layer 50 a ′, a first sheet layer 50 b , and a second sheet layer 50 c.
  • the first sheet layer 50 b may be white, and the second sheet layer 50 c may be transparent.
  • the white first sheet layer 50 b may be seen in the area A 110 of the back sheet 50 overlapping the solar cell, and the colored thin film layer 50 a or the colored pigment layer 50 a ′ may be seen in an area between the solar cells.
  • the colored thin film layer 50 a or the colored pigment layer 50 a ′ may be formed not in the entire area of the back sheet 50 but only in a predetermined area of the back sheet 50 while being positioned between the first and second sheet layers 50 b and 50 c as shown in (b) of FIG. 10 .
  • the colored thin film layer 50 a or the colored pigment layer 50 a ′ may be positioned between the formation areas A 110 of the plurality of solar cells in the entire area of the back sheet 50 and may partially overlap the formation area of the solar cell in consideration of a process margin.
  • a width W 50 of a formation area of the colored thin film layer 50 a or the colored pigment layer 50 a ′ between the solar cells may be greater than a distance D 110 between the solar cells.
  • the colored thin film layer 50 a or the colored pigment layer 50 a ′ may be positioned between the solar cells as shown in FIG. 11 when viewed from the front surface of the solar cell module 100 .
  • the solar cell module 100 is configured such that the colored thin film layer 50 a or the colored pigment layer 50 a ′ of the back sheet 50 is positioned between the solar cells and the white first sheet layer 50 b of the back sheet 50 is exposed to the back surface of the solar cell.
  • the neater appearance of the solar cell module 100 can be implemented while reducing the manufacturing cost of the colored thin film layer 50 a or the colored pigment layer 50 a ′. Furthermore, because light, that is transmitted by the solar cell and then reflected, can be again incident on the solar cell by exposing the white first sheet layer 50 b to the back surface of the solar cell, the efficiency of the solar cell module 100 can be further improved.
  • the back sheet 50 includes the colored thin film layer 50 a or the colored pigment layer 50 a ′ having the same based color as the color of the conductive line 200 , and thus the neater appearance of the solar cell module 100 can be implemented.
  • the embodiment of the invention described the first to third examples illustrated in FIGS. 2 to 4 as an example of the string applicable to the solar cell module 100 , but is not limited thereto. Any interconnector or any conductive line may be applied to the embodiment of the invention as long as they electrically connect the solar cells and are exposed between the solar cells.
  • the interconnector of the clip structure when an interconnector of a clip structure is positioned between two adjacent solar cells, both ends of the interconnector overlap the two adjacent solar cells, one end of the interconnector is connected to first electrodes of one of the two adjacent solar cells using a conductive adhesive, such as a solder, and the other end of the interconnector is connected to second electrodes of the other solar cell using the conductive adhesive, the interconnector of the clip structure may be applied to the embodiment of the invention.
  • a conductive adhesive such as a solder
  • the back sheet 50 may have the same based color as a color of the interconnector of the clip structure.
  • FIGS. 6 to 9 and FIG. 11 illustrate that the second encapsulant 30 b is positioned between the conductive lines 200 and the back sheet 50 , as an example.
  • the second encapsulant 30 b may be omitted in the embodiment of the invention.
  • the back sheet may have the same based color as a color of the patterned conductive lines. Further, the back sheet, on which the conductive lines are patterned, may have the same shape as an insulating substrate.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
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  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Photovoltaic Devices (AREA)
US15/254,719 2015-09-03 2016-09-01 Solar cell module Active 2037-11-11 US10720536B2 (en)

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KR1020150124597A KR20170027956A (ko) 2015-09-03 2015-09-03 태양 전지 모듈
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CN106505121A (zh) 2017-03-15
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CN106505118A (zh) 2017-03-15
EP3139418B1 (en) 2021-11-10
JP2017050541A (ja) 2017-03-09
CN106505118B (zh) 2018-11-02
KR20170027956A (ko) 2017-03-13
JP6312761B2 (ja) 2018-04-18
US20170069767A1 (en) 2017-03-09

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